四川盆地长宁—威远区块海相页岩气田成藏条件及勘探开发关键技术

中国页岩气资源丰富,开发前景广阔,但中国页岩气资源的品质与美国不同,必须发展自己的开发技术.为此,中国石油天然气集团有限公司立足自主创新,围绕四川盆地南部地区龙马溪组页岩气的地质和工程特点,开展了系统的理论研究和技术攻关.通过揭示"沉积-成岩作用控储、保存条件控藏、Ⅰ类储层连续厚度控产"的"三因素控制"海相页岩气富集高...

Accumulation conditions and key exploration and development technologies of marine shale gas field in Changning-Weiyuan block,Sichuan Basin

Shale gas resource is abundant and has a broad development prospects in China,but the quality of shale gas resources in China is different from that in the United States.China must develop its own development techniques.For this purpose,based on independent innovation,China National Petroleum Corporation(CNPC)has carried out systematic theoretical and technical research on the geological and engineering characteristics of Longmaxi Formation shale gas in the southern Sichuan Basin.Guided by"three-factor controlling"theory,i.e.,"reservoir controlled by sedimentation and diagenesis,reservoir forming controlled by preservation condition,and production controlled by continuous thickness of reservoir",for marine shale gas enrichment and high yield,six key exploration and development technologies suitable for marine shale gas suffered from multi-stage tectonic evolution in South China have been established,including comprehensive geological evaluation,developmental optimization,horizontal-well optimal fast drilling,horizontal-well volume fracturing,industrial operation,and efficient and clean production,to industrialize the large-scale exploitation of shale gas.By the end of 2019,the proved geological reserves of shale gas in the southern Sichuan Basin submitted by CNPC had exceeded over 1.06×10¹²m³,the production capacity had reached 100×10⁸m³,with the cumulative gas production capacity of 200×10⁸m³.It has made remarkable achievements and accumulated valuable experience.It is of great significance for developing shale gas industry,reducing the dependence on foreign resources,ensuring national energy security,and realizing the"ecological priority and green development"strategy.